<?php include 'inc/header.php'; ?>

<?php
  $name = $email = $courseName = $content = '';
  $nameErr = $emailErr = $courseNameErr = $contentErr = '';

  // 表单提交 进行验证
  if (isset($_POST['submit'])) {
    // 验证姓名
    if(empty($_POST['name'])){
      $nameErr = "姓名必填";
    }else{
      $name = filter_input(INPUT_POST, 'name', FILTER_SANITIZE_FULL_SPECIAL_CHARS);
    }

    // 验证邮箱
    if(empty($_POST['email'])){
      $emailErr = "邮箱必填";
    }else{
      $email = filter_input(INPUT_POST, 'email', FILTER_SANITIZE_FULL_SPECIAL_CHARS);
    }

    // 验证课程
    if(empty($_POST['course'])){
      $courseNameErr = "课程名称必填";
    }else{
      $courseName = filter_input(INPUT_POST, 'course', FILTER_SANITIZE_FULL_SPECIAL_CHARS);
    }

    // 验证评价内容
    if(empty($_POST['body'])){
      $contentErr = "评价内容必填";
    }else{
      $content = filter_input(INPUT_POST, 'body', FILTER_SANITIZE_FULL_SPECIAL_CHARS);
    }

    if (empty($nameErr) && empty($emailErr) && empty($courseNameErr) && empty($contentErr)) {
      // 添加到数据库
      $sql = "INSERT INTO review (name, email, course_name, content) VALUES('$name', '$email', '$courseName', '$content')";
    
      if (mysqli_query($conn, $sql)) {
        // 成功
        header('Location: reviews.php');
      } else {
        // 错误
        echo "出错：" . mysqli_error($conn);
      }
    }

  }

  
?>
    <img src="/course-review-app/img/logo.png" class="w-25 mb-3" alt="">
    <h2>课程评价</h2>
    <p class="lead text-center">为你所上的课程留下评价</p>
    <form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']) ?>" method="POST" class="mt-4 w-75">
      <div class="mb-3">
        <label for="name" class="form-label">你的姓名</label>
        <input type="text" class="form-control <?php echo $nameErr ? 'is-invalid' : null; ?>" id="name" name="name" placeholder="请输入你的姓名">
        <!-- 显示错误信息 -->
        <div class="invalid-feedback">
          <?php echo $nameErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <label for="email" class="form-label">你的邮箱</label>
        <input type="email" class="form-control <?php echo $emailErr ? 'is-invalid' : null; ?>" id="email" name="email" placeholder="请输入你的邮箱">

        <div class="invalid-feedback">
          <?php echo $emailErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <label for="course" class="form-label">课程名称</label>
        <input type="text" class="form-control <?php echo $courseNameErr ? 'is-invalid' : null; ?>" id="course" name="course" placeholder="请输入课程名称">

        <div class="invalid-feedback">
          <?php echo $courseNameErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <label for="body" class="form-label">评价内容</label>
        <textarea class="form-control <?php echo $contentErr ? 'is-invalid' : null; ?>" id="body" name="body" rows="4" placeholder="请输入你的评价"></textarea>

        <div class="invalid-feedback">
          <?php echo $contentErr; ?>
        </div>
      </div>
      <div class="mb-3">
        <input type="submit" name="submit" value="提交评价" class="btn btn-dark w-100">
      </div>
    </form>
    
<!-- 页面的独特内容 -->
<?php include 'inc/footer.php'; ?>

